Roost pole should be higher than the nests or they'll roost in the nest and poop them up.
They usually feel safer the higher they can roost and will roost as high as possible.
Other circumstances might dictate height of roost...type of bird(heavy birds vs silkies), size of coop(enough room to fly down without hitting a wall), etc.
Pics of coop would help folks give you a better answer.
or you could do a search....advanced search>titles only> roost height
Ive got 3 golf bals in eash nest box
At first a few were using the other boxes then up an quit?? I even changed the bedding an hung a curtain partialy over all the boxes
This morning at 6 am sharp went out to find 1 egg on the floor cracked but good another on top of a nest box ?? These silly fowl are so confusing to me